Pen



FIG. 1 is a perspective view of a pen showing my new design.

FIG. 2 is a right side view of the pen shown in FIG. 1, the left side view being a mirror image thereof.

FIG. 3 is a bottom plan view of the pen shown in FIG. 1.

FIG. 4 is a top plan view of the pen shown in FIG. 1.

FIG. 5 is a front view of the pen shown in FIG. 1; and,

FIG. 6 is a rear view of the pen shown in FIG. 1. 

I claim the ornamental design for a pen, as shown and described. 